#include <stdio.h>

int main()
{
    long i;
    int j;
    printf("Please input number:");
    scanf("%ld",&i);
    {
        for(j = 999;j >= 100;j--)
        if(i%j == 0)
        {
            printf("The max factor with 3 digits in %ld is:%d. \n",i,j);
            break;
        }
    }
}